Apparatus and method for decoding four states with one pin

Details Apparatus and method for decoding four states with one pin Apparatus and method for decoding four states with one pin

1989-06-27

1991-06-11

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307449, 307243, 3072722, 307518, H03K 1902, H03K 1716

Patent

active

050234838

ABSTRACT:
According to one aspect of the invention, a novel control circuit is coupled to a pin at a circuit node. The circuit node has a particular default condition of one of two logic states. The control circuit stores the default value and subsequently attempts to drive an alternate logic state onto the pin. The circuit then reads the logic state at the pin to determine if there has been a change of logic state registered. If a change has been registered, then the existence of a third condition or fourth condition is indicated, depending upon the default logic state.

REFERENCES:
patent: 4306163 (1981-12-01), Blume, Jr. et al.
patent: 4645944 (1987-02-01), Uya
patent: 4661802 (1987-04-01), Yukawa
patent: 4721868 (1988-01-01), Cornell et al.
patent: 4835414 (1989-05-01), Freidin
patent: 4910417 (1990-05-01), El Ganal et al.
patent: 4910466 (1990-03-01), Kiuchi et al.

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